
class CloneUtils {

  /**
   * 拷贝一个对象，新建对象，避免影响源对象
   * @param obj
   * @returns {{}}
   */
  static clone(obj) {
    // Handle the 3 simple types, and null or undefined
    if (null == obj || "object" != typeof obj) return obj;

    // Handle Date
    if (obj instanceof Date) {
      let copy = new Date();
      copy.setTime(obj.getTime());
      return copy;
    }

    // Handle Array
    if (obj instanceof Array) {
      let copy = [];
      for (let i = 0, len = obj.length; i < len; ++i) {
        copy[i] = CloneUtils.clone(obj[i]);
      }
      return copy;
    }

    // Handle Object
    if (obj instanceof Object) {
      let copy = {};
      for (let attr in obj) {
        if (obj.hasOwnProperty(attr)) copy[attr] = CloneUtils.clone(obj[attr]);
      }
      return copy;
    }

    throw new Error("Unable to copy obj! Its type isn't supported.");
  }

}
export default CloneUtils;

